Artificial tooth



N. BLOOM.

ARTIFICIAL TOOTH.

APPLICATION FILED FEB. n, 1920.

Patented Jan. 18,1921.

hfzarr Bloom.

UNITED STATES PATENT OFFICE.

ARTIFICIAL TOOTH.

Application filed February 11, 1920.

T 0 all whom it may concern Be it known that I, NATHAN BLooM, a citizen of the United States, residing at the city of Philadelphia, county of Philadelphia, and State of Pennsylvania, have 1nvented certain new and useful Improvements in Artificial Teeth, of which the following is a specification.

This invention has relation to artificial teeth and has more particular relation to detachable faeings.

The leading object of the present invention may be said to be the provision of an improved form of detachable :t'acing possessed of simplicity, durability, efiiciency, and cheapness of manufacture. A further object is to provide a detachable, artificial tooth which may be successfully employed in bridge, rubber and crown work. A still further object is to provide a detachable facing which may be carded upon wax in contradistinction to being mounted. upon specially designed blocks of wood as at present practised. A still further object is to provide a detachable facing in which the employment of precious metals is re: duced to a minimum. A still further object is to eliminate from a detachable facing the gold tip as commonly practised. With these and other objects in view the invention con sists of the improvements hereinafter de scribed and finally claimed.

The nature, characteristic features and scope of the invention will be more fully understood from the following description taken in connection with the accompanying drawings forming art hereof, and in which:

Figure 1, is an edge view, partly sectioned, of the parts making up my improved facing.

Fig. 2, is a face view of said parts.

Fig. 3, is an edge view of the facing and its button ready for attachment to a backmg plate.

ig. 4, is a cross-sectional view of the parts shown in Fig. 3.

Fig. 5, a similar view of a modified form of construction.

For the purpose of illustrating my invention I 'have shown in the accompanying drawings one form thereof which is at present preferred by me, since the same has been found in practice to give satisfactory and reliable results, although it is to be understood that the various instrumentalities of which my invention consists can be variously arranged and organized and that Specification of Letters Patent.

Patented Jan. 18, 1921.

Serial No. 357,782.

my invention is not limited to the precise arrangement and organization of the instrumentalities as herein shown and described.

In the drawings and referring to Figs. 1 to 4, 1O designates a facing, usually of porce lain, the rear face of which is recessed as at 11 and apertured as at 12. The shape of the recessed portion is immaterial although for illustrative purposes it is shown as being rectangular. One or more apertures 1.2 may be employed as desired. Two are illustrated in the drawings and as an example are circular in form although this is immaterial. Before baking the facing, anchors 13 of platinum or other suitable material are fitted to each aperture 12. Seated within the recessed portion of the facing is a button 14 of suitable material as base metal, which button has projected from one face thereof pins 15 of the shape and equaling the number of apertures 12. These pins are soldered with respect to the anchors so that the facing and button are securely interlocked. As shown in the drawings the button is wedge-shaped although this is not essential. The backing plate is designated 16 and may be of any suitable material as for instance a base metal. The backing plate is provided with a grooved portion 17 shaped and proportioned to receive the button 14. In practice both the button 1 1 and backing plate 16 are formed by machinery so that each part is an exact duplicate and are thus interchangeable without special fitting. With a button soldered to place within a facing the strength of a facing, for all general purposes, is as strong as an ungrooved facing would be so that it is not necessary to tip the bite of the facing with gold as is customary in grooved facings now upon the market. The above described facing may be successfully employed in bridge, rubber and crown work which is decidedly advantageous. A facing and its complemental button may be carded on wax. Heretofore it has been necessary to employ a specially designed block of wood upon which grooved facings are fitted.

In Fig. 5, the construction is the same as above described except that the button 14 instead of being wedge-shaped in cross-section is generally rounded and the groove of the backing plate is of course of a configuration to accommodate a button of this shape.

It will now be apparent that I have devised a novel and useful construction which embodies the features of advantage enumerated as desirable in the statement oi the in vention and the above description and while I have in the present instance shown and described the prett'erred embodiment thereof which has been found in practice to give satisfactory and reliable results, it is to be understood that the same is susceptible of modification in various particulars without departing from the spirit or scope of the invention or sacrificing any of its advantages.

hat I claim is:

1. In a device of the character stated a detachable facing having a grooved and apertured rear :face, a button provided with pins corresponding in number to said apertures for anchorage therein at least a portion of said button being projected beyond the rear face of said facing and a backing plate having formed therein a depressed portion, at least the vertical side walls of which are undercut, said depressed portion being adapted to receive the projected portion of said button whereby said facing and backing are interlocked.

2. A construction as described in claim 1 characterized by said depressed portion being provided. with an upper, horizontal, undercut wall.

3. A construction as described in claims l and 2, characterized by said button being provided with beveled top and beveled side walls.

il. A construction as described in claim l, characterized by said depressed portion and said button being wedge-shaped.

5. In an artificial tooth, a backing plate having that portion thereof adjacent its center struck-up so that the rear face is provided with a vertically disposed projected partsaid struck-up portion :l orming a. recess which increases in depth from the base to its top the front face of said backing plate being fiat throughout its extent, a facing, and means anchored in said facing for cooperatively engaging the recess of said backing plate.

6. A construction as described in claim 5, characterized by the entire portion ol? the rear face of said facing within its marginal extent and surrountling said anchored means presenting a plane surface.

In testimony whereoii I have hereunto signed my name.

NATHAN BLOOM. 

